Move umbraco views to static assets and make that an RCL + Embedded language files (#12324)

* RCL for static assets to replace the nuspec

* Fix build

* Fix unit tests

* clean up in build.ps1

* Removed test (lang files will be removed later anyway)

* Fixed namespaces.. + Ensure we set web root path if missing (e.g. wwwroot folder do not exist) + Added StaticWebAssetBasePath

* fixed namespace

* cleanup

* Set root variable

* Added static assets

* Experimenting with StaticWebAssetBasePath

* Embedded lang files into Umbraco.Core

* Removed legacy test. New test can be implemented instead

* Fixed tests

* clean up

* Fix merge issue

tests/Umbraco.Tests.Integration/DependencyInjection/UmbracoBuilderExtensions.cs

@@ -8,11 +8,13 @@ using System.Linq;
 using Examine;
 using Examine.Lucene.Directories;
 using Microsoft.Extensions.DependencyInjection;
+using Microsoft.Extensions.FileProviders;
 using Microsoft.Extensions.Logging;
 using Microsoft.Extensions.Options;
 using Moq;
 using NUnit.Framework;
 using Umbraco.Cms.Core.Cache;
+using Umbraco.Cms.Core.Composing;
 using Umbraco.Cms.Core.Configuration.Models;
 using Umbraco.Cms.Core.DependencyInjection;
 using Umbraco.Cms.Core.Logging;
@@ -90,7 +92,9 @@ namespace Umbraco.Cms.Tests.Integration.DependencyInjection
                     return new LocalizedTextServiceFileSources(
                         loggerFactory.CreateLogger<LocalizedTextServiceFileSources>(),
                         appCaches,
-                        mainLangFolder);
+                        mainLangFolder,
+                        Array.Empty<LocalizedTextServiceSupplementaryFileSource>(),
+                    new EmbeddedFileProvider(typeof(IAssemblyProvider).Assembly, "Umbraco.Cms.Core.EmbeddedResources.Lang").GetDirectoryContents(string.Empty));
                 }),
                 loggerFactory.CreateLogger<LocalizedTextService>());